How to fire events in a tree component?

Hello

I use the treeSelectionListener, for value change node,

but how can i catch the event when you open a node, is it possible, what is the interfaces to implements?

Because i use this component for data value, and i can not build all the tree before drawn it (to long for user, to much request to database).

I would like to catch the event when an user open node, and inserted child of child in structure. So just build where the user go.

Thank a lot for your help.

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